Lecture 5-Global Temperature Patterns(1)

Lecture 5-Global Temperature Patterns(1) - Global...

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Global Temperature Patterns (Ch. 3)
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Remember…. We expend our net radiation through the three pathways…. Sensible heat transfer (air-surface/surface-air; conduction and convection) Latent heat (water phase changes) Ground heating and cooling Variation in this expenditure between these pathways produces the variety of environments that we experience in nature!
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Ex. Desert environments How is energy expended (net radiation) to produce desert environments?
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Desert Amount of insolation received affected by: Very little water Few clouds Water traps longwave (LW) radiation from sun and ground = blocks sunlight, traps heat at night Dry desert air allows most of sun’s heat to reach the ground during day, and most of Earth’s heat to leave the ground at night (hot days, cold nights)
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Desert High sensible heat production Hot ground Results in high temps and contributes to sparse vegetation! Can you think of other factors that allow desert formation?
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Ex. Agricultural meadow How is energy expended in an environment with vegetation? Usually moist conditions Moderate temperatures
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Agricultural meadow High amounts of energy are expended in latent heat transfer Evaporation from plants Less energy is spent as sensible heat vs. desert Temps are moderated by moisture and balance between pathways of energy expended
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Temperature Different geographical factors operate in determining our different environments and temperature patterns across the Earth…. More on climate and vegetation later! First….temperature and controls of temperature on our planet!
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Heat vs. Temperature Heat is a form of energy that flows from one system to another because they are at different temperatures…. Heat transfers from your skin to the water in a cold pool because of temperature differences…. KE leaves your body and flows to the water-you feel chilled because of this loss of heat.
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Temperature & Heat Temperature is a measure of average KE of molecules in matter… We feel effects of temp as sensible heat transfer from warmer objects to cooler ones Temperature and heat are related because changes in temperature are caused by the absorption or emission (gain or loss) of heat energy…
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Temperature Concepts Air temperature has a strong influence on our lives! Variations in temp regimes affect cultures, decision making, and resources consumed ….
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We use different scales to express temperature Fahrenheit Celsius Kelvin Temperature at which all molecular motion in matter completely stops is absolute zero…. Because we have different temp scales, this value differs from scale to scale.
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